First digit can be any of nine (not "0"), second can also be any of nine, third any of eight, fourth any of seven and fifth any of six, that is 9 x 9 x 8 x 7 x 6 = 27216 such numbers.
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4,536 whole numbers or mixed numbers. 5,040 pure decimals.
There are 625 of them - too many to list.
27 three digit numbers from the digits 3, 5, 7 including repetitions.
2240
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